File:Swiss Cheese in South.JPG
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[編輯]描述Swiss Cheese in South.JPG |
English: Swiss Cheese terrain on the south polar cap of Mars, as seen by Mars Global Surveyor. Original caption is: This image is illuminated by sunlight from the upper left. Looking like pieces of sliced and broken swiss cheese, the upper layer of the martian south polar residual cap has been eroded, leaving flat-topped mesas into which are set circular depressions such as those shown here. The circular features are depressions, not hills. The largest mesas here stand about 4 meters (13 feet) high and may be composed of frozen carbon dioxide and/or water. Nothing like this has ever been seen anywhere on Mars except within the south polar cap, leading to some speculation that these landforms may have something to do with the carbon dioxide thought to be frozen in the south polar region. On Earth, we know frozen carbon dioxide as "dry ice". On Mars, as this picture might be suggesting, there may be entire landforms larger than a small town and taller than 2 to 3 men and women that consist, in part, of dry ice. No one knows for certain whether frozen carbon dioxide has played a role in the creation of the "swiss cheese" and other bizzare landforms seen in this picture. The picture covers an area 3 x 9 kilometers (1.9 x 5.6 miles) near 85.6°S, 74.4°W at a resolution of 7.3 meters (24 feet) per pixel. This picture was taken by the Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) during early southern spring on August 3, 1999. |
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來源 | http://www.msss.com/mars_images/moc/nature_polar/np_2c |
作者 | NASA/JPL/Malin Space Science Systems |
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[編輯]Public domainPublic domainfalsefalse |
本作品由NASA創作,屬於公有領域。根據NASA的版權政策:“NASA的創作除非另有聲明否則不受版權保護。”(參見:Template:PD-USGov/zh,NASA版權政策或JPL圖像使用政策) | ||
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目前 | 2009年10月6日 (二) 14:02 | 418 × 1,150(82 KB) | Jimmarsmars(對話 | 貢獻) | {{Information |Description={{en|1=Swiss Cheese terrain, as seen by mgs. Location is 85.6 S and 74.4 W.}} |Source=http://www.msss.com/mars_images/moc/nature_polar/np_2c |Author=Jim Secosky selected nasa image. |Date=10/6/09 |Permission= |other_versions= } |
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